CN104821596A - Internal model control-based hybrid DC transmission system topology and control method - Google Patents
Internal model control-based hybrid DC transmission system topology and control method Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses an internal model control-based hybrid DC transmission system topology and a control method. In view of a double-end hybrid DC transmission system, a rectifier LCC converter realizes constant DC voltage control on the basis of an internal model control principle; and an inverter-side VSC converter adopts constant AC voltage control and provides stable AC voltage for a passive AC network. A system starting process, load changes, controlled variable setting value step changes, circuit parameter perturbation and other working conditions are controlled. Thus, the internal model control-based hybrid DC transmission system topology and the control method have the following advantages that robust performance is good while certain dynamic performance requirements are met, and when an AC voltage instruction value changes, an inverter-side constant AC voltage controller can change quickly along with changing of the instruction value; AC voltage can be well controlled to be kept stably in the case of load fluctuation; and the controller is simple in structure and simple in parameter tuning, and can be conveniently applied to engineering practice.
Description
Technical field
The present invention relates to a kind of control strategy of Hybrid HVDC system of powering to passive AC network, especially relate to a kind of Hybrid HVDC system topological based on internal model control and control method.
Background technology
In recent years, fast-developing along with high voltage dc transmission technology, based on the consideration of the factor such as application scenarios and economy, the Hybrid HVDC system that LCC converter and VSC converter are formed had good application prospect.For now, Hybrid HVDC system is at wind-electricity integration, light current net and passive network is powered, the fields such as load center transmission of electricity have outstanding superiority of effectiveness to big city etc.Believe the continuous increase of development along with national wind-powered electricity generation and urban power consumption, Hybrid HVDC system will have very wide application prospect.Because Hybrid HVDC system LCC current conversion station all adopts PI controller, traditional PI controller robustness is poor, in start-up course, VSC current conversion station input, load fluctuation or Parameter Perturbation all can cause direct voltage larger fluctuation even system unstability, in order to solve this bottleneck, must improve PI controller.
Summary of the invention
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:
Based on a Hybrid HVDC system topological for internal model control, it is characterized in that, comprising:
One rectification side: electric network source connects six pulsation LCC converters and intermediate point ground connection of two parallel connections by the first converter transformer and the second converter transformer, at the AC of two converters one group of characteristic harmonics filter corresponded under LCC inverter switching frequency in parallel;
One inverter side: VSC converter is linked into electrical network, AC parallel filter filtering characteristic harmonics through connecting impedance; Described VSC converter is connected with LCC converter through DC line; Also with passive load on described inverter side alternating current circuit; Described DC line comprises two the stable electric capacity being connected in parallel on the outlet of inverter side VSC converter; Two LCC Converter DC-side ports of export to connect respectively after a smoothing reactor again with the connection of inverter side VSC converter;
One control circuit: comprise rectification side LCC IMC ?the alternating voltage of determining of PID internal model control and inverter side VSC control;
The IMC of described rectification side LCC ?PID internal model control circuit comprise: direct voltage exports Trigger Angle to LCC converter as input variable through inertial element and PI controller;
The alternating voltage control circuit of determining of described inverter side VSC comprises: alternating voltage is transferred to as input variable determines AC voltage controller and Phase-Locked Synchronous ring, by waveform and the phase place of determining AC voltage controller output reference voltage, export phase signal by Phase-Locked Synchronous ring, two output variables together produce the trigger impulse of each brachium pontis of VSC converter through pulse-triggered link.
Based on a Hybrid HVDC control method of powering to passive network for internal model control, it is characterized in that, comprise
The step of one start-up course, comprising:
Step 1,0.2s unlocks LCC converter and adopts constant DC voltage control to be DC bus capacitor charging, and for avoiding overcurrent, from 0.2s to 1.0s, direct voltage instruction rises to rated value gradually by zero;
Step 2, when DC voltage rises to rated value, unlock VSC converter do and determine alternating voltage and control, 1.0s to 1.1s, alternating voltage instruction rises rated value gradually by zero, energy gradually by electrical grid transmission to load;
The step of one load variations and set point step, comprising:
Step 1,0.2s unlocks LCC converter and adopts constant DC voltage control to be DC bus capacitor charging, and for avoiding overcurrent, from 0.2s to 1.0s, direct voltage instruction rises to rated value gradually by zero;
Step 2, when DC voltage rises to rated value, unlock VSC converter do and determine alternating voltage and control, 1.0s to 1.1s, alternating voltage instruction rises rated value gradually by zero, energy gradually by electrical grid transmission to load;
The step of one main circuit parameter perturbation, concrete grammar is: flat ripple reactance value declines 20%, and filter capacitor declines 20%, line resistance decline 20% adopt IMC ?PID when controlling, the harmonic wave that can well suppress Parameter Perturbation to bring, has better robustness.
Therefore, tool of the present invention has the following advantages: 1. this controller architecture is simple, and parameter tuning is simple, has good robust property meeting under certain dynamic performance requirements.Start-up course, command value change, load change and main circuit parameter perturbation time, all have good robustness, can easily engineering practice be applied to.2. inverter side determines AC voltage controller when changing when alternating voltage command value, can follow rapidly command value change and change; Well can control alternating voltage when load fluctuation and keep stable.
Accompanying drawing explanation
Fig. 1 is total topology schematic diagram of the present invention.
Fig. 2 is the control block diagram of the rectifier related in the present invention.
Fig. 3 is the internal model control principle figure related in the present invention.
Fig. 4 is the control block diagram of the inverter related in the present invention.
Fig. 5 is the start-up course flow chart related in the present invention.
Fig. 6 is the system disturbance process flow diagram related in the present invention.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
If Fig. 1 is whole Hybrid HVDC system topological figure, wherein 1 is AC system, and 2 is alternating current filter, and 3.1 is the first converter transformer, 3.2 is the second converter transformer, 4 is LCC converter, and 5 is converter reactor, 6 bit line equivalent models, 7 is electric capacity of voltage regulation, 8 is VSC converter, and 9,10 for connecting reactance, and 11,12 is passive load.
Specifically comprise:
One rectification side: electric network source connects six pulsation LCC converters and intermediate point ground connection of two parallel connections by the first converter transformer and the second converter transformer, at the AC of two converters one group of characteristic harmonics filter corresponded under LCC inverter switching frequency in parallel;
One inverter side: VSC converter is linked into electrical network, AC parallel filter filtering characteristic harmonics through connecting impedance; Described VSC converter is connected with LCC converter through DC line; Also with passive load on described inverter side alternating current circuit; Described DC line comprises two the stable electric capacity being connected in parallel on the outlet of inverter side VSC converter; Two LCC Converter DC-side ports of export to connect respectively after a smoothing reactor again with the connection of inverter side VSC converter;
One control circuit: comprise rectification side LCC IMC ?PID control and inverter side VSC determine alternating voltage control (Fig. 2 is rectification side LCC converter control system block diagram, and Fig. 3 is internal model control calcspar.Rectification side adopts and realizes constant DC voltage control based on internal model control.)。
Fig. 4 is the control block diagram of the inverter side VSC converter of passive network, adopts and determines alternating voltage control.
Fig. 5 gives the basic procedure of two ends electrical network Hybrid HVDC system starting process, its embodiment is that the first step 0.2 second unblock LCC converter adopts constant DC voltage control to be DC bus capacitor charging, for avoiding overcurrent, from 0.2 second to 1.0 seconds, direct voltage instruction rose to rated value gradually by zero, second step unlock when DC voltage rises to rated value VSC converter do determine alternating voltage control, 1.0s to 1.1s, alternating voltage instruction rises rated value gradually by zero, energy gradually by electrical grid transmission to load, whole start-up course completes.
Fig. 6 gives the basic procedure of two ends bulk power grid Hybrid HVDC system generation disturbance, is the robustness that checking IMC-PID controls, arranges disturbance respectively at 2.0s, 3.0.1.0s moment VSC current conversion station drops into, the alternating voltage command value 10% of 2.0s moment inverter side.During 3s, load that etching system connects declines 1/5.Adopt IMC ?PID and PI control direct voltage, dc current waveform figure, known IMC ?PID control under, direct voltage, direct current all to disturbance reaction not obvious, rated value can be recovered rapidly, IMC ?PID control compared to PI control have better robustness.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (2)
1., based on a Hybrid HVDC system topological for internal model control, it is characterized in that, comprising:
One rectification side: electric network source connects six pulsation LCC converters and intermediate point ground connection of two parallel connections by the first converter transformer and the second converter transformer, at the AC of two converters one group of characteristic harmonics filter corresponded under LCC inverter switching frequency in parallel;
One inverter side: VSC converter is linked into electrical network, AC parallel filter filtering characteristic harmonics through connecting impedance; Described VSC converter is connected with LCC converter through DC line; Also with passive load on described inverter side alternating current circuit; Described DC line comprises two the stable electric capacity being connected in parallel on the outlet of inverter side VSC converter; Two LCC Converter DC-side ports of export to connect respectively after a smoothing reactor again with the connection of inverter side VSC converter;
One control circuit: the alternating voltage of determining of the IMC-PID internal model control and inverter side VSC that comprise rectification side LCC controls;
The IMC-PID internal model control circuit of described rectification side LCC comprises: direct voltage exports Trigger Angle to LCC converter as input variable through inertial element and PI controller;
The alternating voltage control circuit of determining of described inverter side VSC comprises: alternating voltage is transferred to as input variable determines AC voltage controller and Phase-Locked Synchronous ring, by waveform and the phase place of determining AC voltage controller output reference voltage, export phase signal by Phase-Locked Synchronous ring, two output variables together produce the trigger impulse of each brachium pontis of VSC converter through pulse-triggered link.
2., based on a Hybrid HVDC control method of powering to passive network for internal model control, it is characterized in that, comprise
The step of one start-up course, comprising:
Step 1,0.2s unlocks LCC converter and adopts constant DC voltage control to be DC bus capacitor charging, and for avoiding overcurrent, from 0.2s to 1.0s, direct voltage instruction rises to rated value gradually by zero;
Step 2, when DC voltage rises to rated value, unlock VSC converter do and determine alternating voltage and control, 1.0s to 1.1s, alternating voltage instruction rises rated value gradually by zero, energy gradually by electrical grid transmission to load;
The step of one load variations and set point step, comprising:
Step 1,0.2s unlocks LCC converter and adopts constant DC voltage control to be DC bus capacitor charging, and for avoiding overcurrent, from 0.2s to 1.0s, direct voltage instruction rises to rated value gradually by zero;
Step 2, when DC voltage rises to rated value, unlock VSC converter do and determine alternating voltage and control, 1.0s to 1.1s, alternating voltage instruction rises rated value gradually by zero, energy gradually by electrical grid transmission to load;
The step of one main circuit parameter perturbation, concrete grammar is: flat ripple reactance value declines 20%, and filter capacitor declines 20%, and when line resistance decline 20% adopts IMC-PID to control, the harmonic wave that can well suppress Parameter Perturbation to bring, has better robustness.
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| CN105429165A (en) * | 2015-12-23 | 2016-03-23 | 湖北工业大学 | Multi-port hybrid DC power transmission system topology for power supply to multi-droppoint passive network and control method of multi-port hybrid DC power transmission system topology |
| CN105576689A (en) * | 2016-01-07 | 2016-05-11 | 武汉大学 | DC voltage feedback-based AC voltage control method for flexible DC transmission system |
| CN105720598A (en) * | 2016-03-09 | 2016-06-29 | 全球能源互联网研究院 | Calculation method for fixed DC voltage controller parameter of voltage source converter |
| CN106936154A (en) * | 2015-12-29 | 2017-07-07 | 中国电力科学研究院 | Start method for the grid-connected series-parallel connection direct current network of extensive remote offshore wind farm |
| CN107623341A (en) * | 2017-10-19 | 2018-01-23 | 湖北工业大学 | A kind of VSC Inverter Station overall situation small signal mathematical models powered to passive network and internal mode controller |
| CN108089436A (en) * | 2017-12-17 | 2018-05-29 | 北京世纪隆博科技有限责任公司 | Quick non-overshoot intelligent controller Parameters design |
| WO2018196381A1 (en) * | 2017-04-27 | 2018-11-01 | 许继集团有限公司 | Passive control method, device, and storage medium for bipolar voltage source converter |
| CN112417692A (en) * | 2020-11-24 | 2021-02-26 | 华东交通大学 | Multi-scale topological optimization design method of material structure based on load uncertainty |
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| CN106936154B (en) * | 2015-12-29 | 2021-10-01 | 中国电力科学研究院 | Series-parallel direct-current power grid starting method for large-scale long-distance offshore wind power grid connection |
| CN105576689A (en) * | 2016-01-07 | 2016-05-11 | 武汉大学 | DC voltage feedback-based AC voltage control method for flexible DC transmission system |
| CN105576689B (en) * | 2016-01-07 | 2018-08-21 | 武汉大学 | A kind of flexible direct current power transmission system alternating voltage control method of DC voltage feedback |
| CN105720598A (en) * | 2016-03-09 | 2016-06-29 | 全球能源互联网研究院 | Calculation method for fixed DC voltage controller parameter of voltage source converter |
| WO2018196381A1 (en) * | 2017-04-27 | 2018-11-01 | 许继集团有限公司 | Passive control method, device, and storage medium for bipolar voltage source converter |
| CN107623341A (en) * | 2017-10-19 | 2018-01-23 | 湖北工业大学 | A kind of VSC Inverter Station overall situation small signal mathematical models powered to passive network and internal mode controller |
| CN107623341B (en) * | 2017-10-19 | 2020-01-24 | 湖北工业大学 | VSC inverter station mathematical model for supplying power to passive network and internal model controller |
| CN108089436A (en) * | 2017-12-17 | 2018-05-29 | 北京世纪隆博科技有限责任公司 | Quick non-overshoot intelligent controller Parameters design |
| CN108089436B (en) * | 2017-12-17 | 2022-02-08 | 北京世纪隆博科技有限责任公司 | Parameter design method for rapid non-overshoot intelligent controller |
| CN112417692A (en) * | 2020-11-24 | 2021-02-26 | 华东交通大学 | Multi-scale topological optimization design method of material structure based on load uncertainty |
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